Change Sum Payment

Create a payment where the customer can modify the payment amount before proceeding. The customer is redirected to a page where they can enter a new amount, after which the payment is processed with the updated value.

POST

***

Request Parameters

Name	Type	Description
`public_key`Required	`String`	Merchant identifier. Example: `i000000001`
`amount`Required	`Number`	Initial payment amount. The customer can change this value. Example: `100`, `20.50`
`currency`Required	`String`	Payment currency. Values: `AZN`, `USD`, `EUR`, `RUB`
`language`Required	`String`	Page display language. Values: `az`, `en`, `ru`
`order_id`Required	`String`	Unique order ID in your application. Max 255 characters.
`description`Optional	`String`	Payment description. Max 1000 characters.
`success_redirect_url`Optional	`String`	Redirect URL on successful payment.
`error_redirect_url`Optional	`String`	Redirect URL on failed payment.
`other_attr`Optional	`Array`	Additional payment parameters.

Request Example

Build the JSON payload, encode and sign it, then send as POST. See Authentication for signing details.

Send Request

Payload

{
  "public_key": "i000000001",
  "amount": "50.00",
  "currency": "AZN",
  "language": "az",
  "description": "Flexible payment",
  "order_id": "1"
}

1# Encode & sign
2DATA=$(echo -n '{"public_key":"i000000001","amount":"50.00","currency":"AZN","language":"az","description":"Flexible payment","order_id":"1"}' | base64)
3SIGNATURE=$(echo -n "$PRIVATE_KEY$DATA$PRIVATE_KEY" | openssl dgst -sha1 -binary | base64)
4
5curl -X POST *** \
6-H "Content-Type: application/x-www-form-urlencoded" \
7-d "data=$DATA&signature=$SIGNATURE"

Response Parameters

Name	Type	Description
`status`Required	`String`	Operation result: `success` or `error`
`redirect_url`Optional	`String`	URL to redirect the customer to the amount change page. The customer can enter a new amount on this page. Present on success.
`message`Optional	`String`	Error description. Present on failure.
`trace_id`Required	`String`	Unique request identifier for debugging. Provide this to Epoint support for issue investigation.

Response

1{
2  "status": "success",
3  "redirect_url": "***",
4  "trace_id": "a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6"
5}